Here is the full list of all 22 Megapolis achievements.
Reach 25 total happiness.
Earn 12 gold stars.
Earn 12 trophies.
Upgrade 300 buildings.
Demolish 100 buildings.
Buy 20 licenses.
Build 250 buildings.
Upgrade 100 buildings.
Train 100 workers.
Clear 75 plots.
Demolish 25 buildings.
Build 75 buildings.
Upgrade 25 buildings.
Demolish 5 buildings.
Build 10 buildings.
Earn $100,000,000.
Order 150,000 units of material.
Build a zone with 5,000 residents.
Win 12 sandbox scenarios.
Earn all the gold stars.
Earn all the trophies.
Complete the entire campaign.